NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-05-25 T11:28:57 PDT
Help | Comment | NED Home

For refcode 1990A&A...229...64R:
Retrieve 105 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by European Southern Observatory (ESO). Reproduced by permission
1990A&A...229...64R The manifold of early-type galaxies from IR photometry: the Coma cluster E. Recillas-Cruz, L. Carrasco, A. Serrano P.G., and I. Cruz-Gonzalez Instituto de Astronomia, U.N.A.M. Apartado Postal 70-264, Ciudad Universitaria, Mexico, D.F., CP 04510 Observatorio Astronomico Nacional, U.N.A.M. Apartado Postal 877, Ensenada B.C., Mexico, CP 22860 Received April 14, accepted July 17, 1989 Abstract. We have obtained accurate infrared JHK photometry for 38 elliptical, 48 lenticular, 18 spiral and 1 irregular galaxies members of the Coma Cluster. Color-color, (J - H) versus (H - K), and color-luminosity diagrams, are discussed for the early-type galaxies observed. Our study shows no definite trends in (J - H), (H - K) and (J - K) vs. K_-0.3_ diagrams. The aperture corrected (V - K)_-0.3_ vs. K_-0.3_ diagram reveals a weak relationship between color and magnitude for the early-type galaxies in this cluster. Published values of the metallicity index Mg_2_ are compared with the luminosities L_B_ and L_K_, and correlations are found: as expected, brighter galaxies present larger mean metallicities. Aperture corrected magnitudes at several wavelengths for early-type galaxies were used in order to establish relationships between the velocity dispersion (sigma, surface brightness (I_e_) and luminosity. The main results for early-type galaxies members of the Coma cluster are: (i) The power of the L-{sigma} relationship increases with increasing wavelength, reaching the value 3.88 at 2.2 micron. This value is in very good agreement with the theoretically expected virial value of 4 for a system fully supported against gravity by random motions. (ii) The power {alpha} of the relationship L is proportional to I{sigma}^{alpha}^I^-{beta}^_e_ increases toward IR wavelengths, while the power beta remains almost constant with wavelength. (iii) The M/L ratio dependence on luminosity decreases monotonically with wavelength, being almost independent of the luminosity of the system at 2.2 microns; while the dependence on mean surface brightness of the system increases significantly at longer wavelengths. From this, we conclude that the distended systems are not by-products of the merging of normal stellar systems. Key words: clusters of galaxies - infrared radiation - galaxies: kinematics and dynamics - galaxies: elliptical - galaxies:. lenticular - galaxies: stellar content
Retrieve 105 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home